Hybrid propulsion generally combines a liquid oxidizer with a solid fuel.

If the liquid oxidizer is an acid, the spill should first be neutralized with sodium bicarbonate.

The aim of this project is to create a fundamentally new hybrid engine that can use atmospheric air and a liquid oxidizer.

An insensitive combined cycle missile 10 propulsion system includes a solid fuel 16 contained within a first section of the missile 10, and a liquid oxidizer 14 contained within a second section of the missile 10.